# str ="day day up"
# for i in range(len(str)):
#     print(str[i],end="")
# print()

# list1=[]
# # list1[0]=1
# # list1[1]=2
# list.append(3)
# print(list1)

# list2=[1,2,3]
# list3=list()
# list3.append(1)
# list3.append(2)
# list3.append(3)
# list3.append(4)
# print(list3)

list2=[1,2,3]
list2.insert(1,10)
for i in list2:
    print(i)

list2=[1,2,3]
list2.insert(1,10)#插入
print(list2)

list2.extend([11,12])#拼接
list2.sort(reverse=True)
print(list2)

# list2.sort()#排序
# print(list2)
# list4=range(1,3)
# print(list4)

list3=sorted(list2)
print(list2)
print(list3)
del list3
# print(list3)

list4 =[1,3,5,7,9]
#1-10
list5=[i**2 for i in range(1,10) if i%2!=0]
print(list5)

str=('1111')
print(str)